The “Casanova” cop who was allegedly shot by his wife, a fellow officer, as payback for his wandering eye is suing the NYPD for $3 million, claiming they should have known she was too nuts to carry a gun.

She was “violent, unstable, and too dangerous to continue to possess an NYPD issued firearm,” Todd Jamison’s lawsuit, filed this week in Brooklyn federal court, claims.

Alison is charged with shooting Todd, 44, in a jealous rage last April 10 when she learned he’d strayed from their marital bed less than a year after they married.

The vengeful woman tailed her philandering husband’s car through East New York, then pulled her rental alongside his Mercedes and fired her police-issue firearm, cops say. He was hit three times in the chest and once in the arm.

Spicer-Jamison, who had been a cop since 1994, was arrested a few hours later at a Newark Airport car rental and charged with attempted murder.

The scorned woman had a bad history – and the NYPD knew that, said Todd Jamison’s attorney, Michael Mays.

“There were allegations that she had violence against men. She may have tried to hit someone in a car,” Mays said, but declined to elaborate.

The Post reported last year that Spicer-Jamison was suspected of nearly mowing down a romantic rival using her squad car in 1998.

At the time, she was having an affair with the victim’s fiancé, who was also her patrol partner. The victim said she reported the incident to the NYPD, and as a result, Spicer-Jamison was moved from Staten Island to the 70th Precinct in Brooklyn.

A police official said last year that there had been an Internal Affairs investigation into the Incident, but said there was no allegation that Spicer-Jamison had tried to run anyone down.

Todd Jamison’s suit also names the Patrolmen’s Benevolent Association, the City of New York, the NYPD, and his wife, who’s currently incarcerated at Rikers Island, awaiting a trial date.

Jamison, who had retired from the force in 2005, was working as a basketball coach at the time of the incident.

He lost use of one of his arms due to the attack and has not been able to return to work, said Mays. “He’s coping. He’s like any victim, trying to bounce back,” he said.

Spokesman for the NYPD and the PBA both said they knew nothing of the lawsuit.

The Jamisons had been married for less than a year when Todd began having an affair with an Onondaga County deputy sherriff. But his third wife couldn’t claim she didn’t know what she was getting into – she stole him away from his second wife, Nina.